摘要
对秦山第二核电站3号机组高压缸缸体厚度过渡区域的裂纹进行了焊接修复。分析了焊接修复技术难点,给出了焊接修复具体操作步骤。焊接工艺试验结果表明,采用镍基焊材获得的焊接接头抗拉强度为505MPa,焊接接头经正弯、背弯后无裂纹,焊缝冲击吸收功为150J,焊缝组织为奥氏体及铁素体,接头组织性能满足高压缸缸体运行工况要求。高压缸缸体裂纹经焊接修复运行1年后,未发现缺陷,说明焊接修复效果良好。
Cracks were found at the curvature transient zone of high pressure cylinder during the maintenance of the No. 3 unit in Qinshan No. 2 Nuclear Power Station,which may cause safety ac- cident during operation. The welding repair technology for ZG15Cr2Mol cylinder was developed through the welding experiment, microstructure analysis and mechanical test. The difficulties in welding repair were presented and the detail operation steps were given. The results showed that, tensile strength of the weld joint by nickel based weld material was 505 MPa;cracks were not ob- served after bending test;the impact absorbing energy was 105 J. The mechanical properties indi- cated that the austenitic weld satisfied the operational requirement of the cylinder. The developed welding repair technology was adopted during in-field repair of the high pressure cylinder. After one year in-site operation, the repaired zone exhibited a good effect.
出处
《热力发电》
CAS
北大核心
2014年第1期137-139,124,共4页
Thermal Power Generation
关键词
核电机组
高压缸
裂纹
焊接工艺
镍基焊材
nuclear power plant high pressure cylinder
cracks
welding repair
welding technolo-gy
nickel-based welding material
